So I run my 6mo old pup dang near everyday behind my house and he has had a few good chases, he has just started to find his wheels and has pushed a few rabbits in a couple circles, well last week he had a good chase right at dark and chased him into the neighbors corn field. watching the gps he went out about 150 yards before chasing the rabbit back towards me, got about 30 yards away and lost the trail but I was pretty darn proud of him as it was the farthest he has chased one yet. 2 days later he pushes another one in there for a great sight chase and brought him back out towards me and lost him in a big knarl of thick stuff. fast forward to this week and now he associates that corn field with rabbits and will run up and down that field looking for em and I have had to hike through that corn and drag him back out the last 2 times ive ran him. He listens great when at the house and knows the COME command but soon as he starts hunting he ignores me if he is farther than 10 yards away. I have a astro so i can track but not shock and i plan on buying one real soon to have that feature but what else can I do to drive home the COME command? tramping through a wet cornfield to grab him aint too fun. I bought a whistle and started using that when calling him but it doesnt seem to help yet.